Compressor unit



Aug. 15, 1939 P. MANISCALCO COMPRESSOR UNIT Filed Aug. 17, 1938 2Sheets-Sheet 2 W \\\\N W\\\\\\ u Im Patented Aug. 15, 1939 UNITED STATESPATENT OFFICE 8 Claims.

pressor unit.

One of the objects of this invention is to provide a compact sealedcompressor unit of a sim- |5 plifled and economicai arrangement andconstruction.

Another object of this invention is to provide a sturdy compressor of animproved construction whereby the installation and likewise the replacelment of the compressor members within the casing is simplified, and yetthe compressor remains durable and eflicient.

Another object of this invention is to provide a compressor comprisingimproved lubricating 15 means.

These and various other objects and advantages are attained with thisinvention, as will become apparent from the following description, takenin connection with the accompanyng drawings 20 wherein the invention isillustrated in its preferred form, it being apparent that'various otherarrangements and forms of construction may be adopted for carrying outthe objects and purposes of this invention.

25 In the drawings:

Fig. 1 is a plan view of a compressor embodying the present invention inits preferred form of construction.

Figs. 2 and 4 are enlarged vertical sectional 30 views of thiscompressor, taken on lines 22 and 44, respectively.

Fig. 3 is a perspective view of the supporting guide plate.

This invention embodies a sealed and compact 35 compressor unit, whichis preferably of the multistage type, and which is illustrated in thedrawings in the preferred form of construction. It comprises a casing orhousing 5 including integral walls 6, l, 8 and 9, and the opposite walls6 and 0 8 thereof have integral sleeves il and i2 extending in oppositedirections therefrom, providing cylinder chambers II and IZ therein.These cyhnders have the longitudinal axes aligned, and the cylinder l lis larger than the cylinder l2 and 45 forms the primary compressioncylinder, while the cylinder I2 forms the secondary compressioncylinder. Closuremembers or heads i3 and M are removably mounted ontheouter ends of cy]- 'inders il and i2, respectively, by suitable bolts 50or the like, while an inlet pipe l5 is connected to head l3, and anoutlet pipe IG is connected to head l4, and check valves ll and Is aremounted in suitable pockets provided in heads I3 and M, to admit thepassage of the fluid only from pipe 55 IS to pipe IS.

This invention relates to an improved com- The piston unit 20 comprisesat its opposite ends a larger primary piston 2| and a smaller secondarypiston 22, which fit and operate in the cylinder chambers ll and i2',and are provided with suitable piston rings. Said pistons 2| and 5 22contain end pockets 23 and 24, respectively, having check valves 25 and26 therein, while a bore 21 extends longitudinally thru the piston unit20, from pocket 23 to pocket 24. This provides a larger compressionchamber Il to effect the primary compression, wherefrom the fluid flowsthru the bore 21 into secondary chamber I2' where it is subjected to ahigher stage of compression and is then delivered to outlet pipe IG.

The means provided for reciprocating or operating the piston unit hasits essential operating members housed within the casing, the samecomprising an operating member or post 30 having lower side flanges 3|thereon mounted in undercut portions 32' of a guide groove 32 providedin the upper part o! a base plate 33 and being thereby retained slidablyin place. Said plate has bottom flanges 34 set in a groove in the bottomof the casing, being secured in place by the use of screws or the like,thereby closing the lower end of the upstanding integral walls of thecasing, said lower end being mounted on a suitable base, as indicated inthe drawings.

The operating member includes a pair of spaced upper side plates orwalls 35 providing -a 30 trough or groove therebetween wherein themiddle part of piston unit 20 fits closely. A saddle 36 bears tightlyupon piston unit 20 between said side walls and is secured to the wallsby bolts 31. A collar or fiange 38 is provided on the piston 35 unit,being preferably integral therewith, and is placed adjacent the smallerpiston 22 to engage said walls 35 and retain them in place between saidcollar and the larger piston 2l, so that said piston unit will travelwith this operating member 30.

A drive shaft 40 is rotatably mounted in a bearing collar il which isremovably mounted on wall l and contains thereon a stufllng nut 42provided with sealing rings 43 therein, said shat 40 extend- 45 ingbeyond the nut and having a driving member thereon, for example, a.pulley M driven by a belt 45. Said shaft has antiriction bearing means46 mounted thereon, at the inward side of collar 4|, placed against anenlarged part 4'l of the drive shaft, while at its inner end the shaitis mounted by antifriction bearing means 48 in a boss 43 which isintegral with and extends inwardly of the casing wall 3.

A circular driving member 50 is eccentrically positioned on the enlargedpart ll of the drive shaft and operates rotatively in a verticallyelongated channel or opening l in operating post 30, whereby toreciprocate the pistons in the cy]- inders. V

A top plate or cover 52 is removably mounted on the upper end of thecasing walls, as by means of bolts 3, and by the use of suitable sealingmeans or rings 54. Wise provided wherever required.

The casing is adapted to have lubricating oil or similar lubricatingmeans placed therein for lubricating the movable parts; and an improvedmechanism for distributing the lubricant is also provided whichcomprises splash fingers 55 extending radially from the enlarged part llo! the shatt, adapted to lift and splash the lubricant upward to thepistons. and also upon the eccentric and the bearings,"when thelubricant is no longer standing above the bearings. A lubricant grooveI| is provided at a slant and substantially diagonally across the upperface of plate 33, to aid in distributing the lubricant across theslidable lower face of the operating member 3II.

Openings 51 are provided in one of the walls. preterably in wall l, totacilitate passing bolts 31 therethru for inserting the same into sidewalls 35 and saddle 30 of the operating member 3ll. and a plug El issecured therein in each opening to close the same. y

Chamters of b evels I and 62 are provided in the casing, respectively,on the Joining edge portions between the casing walll and its cylihderchamber ll, and between the casing wall l and its cylinder chamber l2',as shown in 'Fig. 4. These chamfers are to drain of! excessivelubrication on the piston and allow it to flow back into the bottom ofthe casing I; and it aids in preventing oil from getting into the outletpipe IS. This also serves to keep the lubrication on the piston at aproper minimum amount.

This construction provides a compact and sealed casing for the operatingmembers of the compressor, and also provides an improved lubricatingmechanism therefor, irnview of the splash 7 fingers 55 and the groove 56and the chamfers 6| and 62, and the lubricant can also be maintainedherein above the operating shatt and its bearings.

The construction furthermore is simple and durable and facilitatesconvenient and easy installing and replacing of the mechanism in thecasing. In this procedure, the piston unit 20 is inserted thru thelarger cylinder ll; and operating member 3| has its lower flanged partll slid into groove 32 of base plate 33 and is therewith inserted fromthe bottom into the casing, whereby the intermediate piston portion,which extends from the larger piston to the collar 3l, is placed betweenthe walls 35 of said member 3|I, and said plate 33 is then secured tothe casing to close its lower end. The saddle 36 is added and the boltsl entered thru holes ll, and the nuts placed on the bolts for securingsaddle 36 with walls 35 upon the intermediate portion of piston 20. Thedrive shaft with its bearings and the eccentric o are entered thru theside opening in wall l, and the bearing collar 4| with its stufiing nut42 are then secured around the shaft and to the side of the housing, bythe bolts 4|, and the drive member is next attached to the shaft. Thedesired quantity of lubricant is then placed in the casing, and thecover plate 52 is secured thereon, thereby closing the casing andsubstan- Other sealing means is like tially sealing the same with itslubricant and its operating members enclosed therein.

I claim:

1. A compressor cmprising a casing which is substantially sealed and hascylinder means extending integral from its wall means and opening intothe casing, cap means with fluid conduit means on the outer ends of thecylinder means to close the same, piston means reciprocable in thecylinder means and in the casing, a bottom member on the casing having aguide channel therein provided with an oil groove slanting across itsface, an operating post in the casing engaging and actuating said pistonmeans and having a foot portio slidable in said guide channel, drivingmeans entering the casing for driving said operating member, and splashfingers on said driving means in the casing adapted' to splash andelevate lubricant positioned in the casing.

2 A compact compressor unit comprising a closed and sealed casingincluding integral upright walls. two opposite walls being provided witha pair of integral outward1y extending cylinders which are in alignment,a pair of valved closure caps on the outer ends of the cylinders, onehaving an inlet conduit and the other having an outlet conduit thereon,a piston unit with a pair of pistons on its ends operating in saidcylinders, an operating member in the casing engaging said unit forreciprocating it and including a lower supporting foot. a bottom wallremovably mounted on and closing the bottom of said upright walls andhaving a guide channel slidably receiving said foot, a bearing collardetachably mounted in an opening provided in one A wherein the bottomwall is provided with an oil.

groove for lubricating the foot, and splash fingers are provided on thedriving shaft to agiv tate lubricant placed in said closed casing.

4. A compact multistage compressor unit comprising a closed and sealedcasing including integral upright walls, two opposite walls beingprovided with a pair of integral outwardly extending cylinders which arein alignment, a pair of valve closure caps on the outer ends of thecylinders, one having an inlet conduit and the other having an outletconduit thereon, a piston unit with a pair of pistons on its endsoperating in said cylinders, there being a valved channel thru thepiston unit providing a one-way passage between the cylinders, anoperating member in the casing connected with said unit forreciprocating it and including a lower supporting foot, a bottom wallremovably mounted on and closing the bottom 01 said upright walls andhaving a guide channel slidably receiving said foot, a bearing collardetachably mounted in an opening provided in one of said walls, a driveshat extending thru said collar and having means thereon functioning insaid operating member for reciprocating it and the piston unit, and atop member tightly but removably mounted on. the top of said uprightwalls, whereby the casing is closed fluid tight and the memberscontained therein are readily removed and installed.

5. A compressor comprising a casing having a detachable bottom and apair of cylinders extending in opposite directions from the casing wallsand in alignment, valved means on the Outer ends of the cylinders, apiston unit in the casing including an intermediate body part withintegral oppositely extending pistons reciprocable in said cyiinders, anoperating member in the casing provided With upper forks and saddlemeans thereon embracing the intermediate part of the piston unit andalso provided with means at its lower end to support and guide it on thebottom of the casing, said member being withdrawable thru the bottomopening, and driving means provided With means engaging said member inthe casing for reciprocating it and the piston unit.

6. A compressor comprising a casing having cylinder means extending fromthe casing wall means, a piston unit in the casing including pistonmeans reciprocable in the cylinder means, a grooved guide plateproviding the detachable bottom wall of the casing, an operating memberin the casing detachably connected to and depending from the piston unitfor reciprocating it and including an integral foot provided withflanged means at its lower end to support and hold it slidably and guideit by t e grooved guide plate, said member being remova le with theplate from the casing, and driving means provided with means engagingsaid member in the casing for reciprocatng it and the piston unit.

7. A compressor comprising a closed casing containing integral uprightwalls with a detachable closure plate thereon and including two oppositewalls provided with integral cylinders extending in opposite directionstherefrom and in alignment, a piston unit in the casing includingoppositely extending pistns reciprocable in the cylinders, a guide platedetachably mounted on and closing the bottom of the casing andcontaining a guide channel, an operating member in the casing connectedto the intermediate part of the piston unit and provided with lowerflanged means supported in and guided by said guide channel, and a driveshaft entering said casing and provided with an eccentric rotatable in aslot in said operating member for reciprocating it and the piston unit,whereby the casing is closed tight and the members therein are readilyremoved and installed.

8. A compressor comprising a closed casing containing integral cylindermeans on its walls opening into the casing, piston means in saidcylinder means and casing, a guide plate at the bottom of the casinghaving a guide channel with a diagonally extendng lubricant groove andwith undercut side groove means, an operating member in the casingforactuating the piston means and having a foot portion slldable in thechannel and provided with side flange means engaging in the undercutmeans to retain it in position, driving means entering the casing foractuating said operating member. and means in the casing on said drivingmeans adapted to agitate lubricant housed in the casing.

PIEIRO MANISCALCO.

